#include <iostream>
#include <cmath>

class Circle {
private:
    double radius;

public:
    void setRadius(double radius) {
        this->radius = radius;
    }

    double getRadius() {
        return radius;
    }

    double calculateArea() {
        return M_PI * radius * radius;
    }

    double calculateCircumference() {
        return 2 * M_PI * radius;
    }
};

int main() {
    Circle circle;
    circle.setRadius(5.0);
    std::cout << "Circumference: " << circle.calculateCircumference() << std::endl;
    std::cout << "Area: " << circle.calculateArea() << std::endl;

    return 0;
}
